Injectors



March 4, 1958 BAKKER INJECTORS File ad March 5, 1956 INVENTOR JMMNNE5 BfiKKEfi ATTORNEY? United States Patent INJECTORS Johannes Bakker, Lange Ruige Weide, Netherlands Application March 5, 1956, Serial No. 569,537 Claims. (Cl. 103-263) The invention relates to an injector for displacing'a medium with the aid of a compressed gas, inwhich the medium to be transported passes through a central tube without alteration of direction and the gasis supplied at the circumference .of the tube through an injectiono'p'e'ning. 1

Such an apparatus is already known. With the known apparatus, a separate piping is necessary for supplying the compressed gas. a I

The invention aims at providing an injector whereby this drawback is overcome.

According to the invention, the salient object is obtained by positioning around the tube, an axially sucking and delivering compressor for the compressed gas, the

hollow spindle of which lies around the tube and merges at the delivery side into the injection-opening, while around the tube a sealing ring is arranged between the inlet side and outlet side of the hollow compressor spindle. In this way, an injector pump is obtained with which no piping is necessary for supplying the compressed gas, so that the apparatus can easily be installed and is well adapted for use as a temporary pump installation, more particularly for impure media, such as waste water, concrete mixtures or the like.

Appropriately the injector housing is defined as a Venturi-tube and the tube projecting therein for the medium to be transported is made adjustable. Hence, the injector action can be adjusted as desired and dependent on the medium to be transported.

In practice, the compressor is appropriately provided with a rotor part lying eccentrically in the compressor part and having radial slots containing slidable partitions, while in the parts of the rotor between the slots, radial channels are arranged near both ends thereof, which channels connect the working spaces of the compressor with the interior of the hollow spindle and the ends of the sealing ring are shaped in such a manner that during each revolution of the compressor, the ends of the channels in the rotor merging into the hollow spindle are alternately covered and uncovered and thereby serve as steering means for the alternative connection of the work spaces of the compressor with the suction side and the delivery side. In this way, a very powerful injector action is obtained with extremely simple construction and good maintenance of the medium transport tube.

In practice, the rotor part is further appropriately provided with an axial suction stud at one side, which is fixedly connected thereto and at the same time carries the driving pulley and is supported on both sides between fixed end shields mounted on a sole plate, of which end shields, the one lying remote from the suction stud at the same time carries the stationary delivery stud which forms the injector housing.

The invention will now be further elucidated with reference to an embodiment shown in the drawing, In the drawing:

Fig. 1 shows a horizontal longitudinal section of an injector according to the invention, and

' able.

2,825,290 Patented Mar. 4, 1958 'ice Figures 2 and 3 show cross-sections according to the lines 2-2 and 3-3 in Figure 1.

In the drawing, 1 indicates the sole plate on which a pair of end shields 2 and 3 are secured by means of bolts or the like. Between these end shields the jacket 4 of the compressor housing and the rotor part 5 are mount ed with lining and bearing plates 6 and 7 being inserted between the jacket and rotor part and the end shields. The rotor part is perforated in the axial direction and carries .on one side an inlet stud 8 corresponding with which, at the outside of the end shield 2, the driving pulley 9 is mounted. The rotor part 5 is further pro-' vided with axial slots 10 in which partitions 11 are slid- Between the axial slots with the partitions, the rotor part is provided with radial bores 12 and 13 re; spectively, near both ends, merging with the central'bore of the rotor part. The end shield 3 is provided with a stationary delivery or outlet stud 14 corresponding with the central bore in the rotor part, which stud at the same time forms the injector housing and is defined as a Venturi tube at 15. Through the central bore of the rotor part,"

a tube 16 projects from the suction side into the injector housing 14, 15, which tube is freely positioned in' the central space, and serves for the admittance of the m'ed-- ium to be transported, such as waste water or concrete or like viscous substances. The tube is supported forwardly of the inlet stud 8 by a support 17 and carries in the central bore of the compressor at the outside, a fixed sleeve or ring 18 which is provided at both ends with border recesses 19 and 20 respectively, corresponding with the mouths of the radial channels 12 and 13 respectively, in such a manner, that they are each covered and uncovered on a part of the circumference of the central bore. The recesses are further made of an extent less than in such a manner that always channels 12 and 13 lying in the same axial plane, are simultaneously closed for a short time at the moment of passage, as indicated in Figure 1 by the dotted small circles.

During working of the pump, the partitions 11 will be moved outwardly by the centrifugal force until they lie against the cylindrical jacket 4 of the compressor housing. By the increase of the contents of the space between the rotor 5 which is mounted eccentrically in the compressor housing, during the rotation of the rotor, air is sucked in through the inlet stud 8. When the space between a pair of partitions 11 has reached its greatest ex tent, the channel 12 lying between these partitions passes the end of the border recess 19 of'the sealing and steering ring 18 and is closed. Immediately thereafter the radial channel 13 belonging thereto is opened by the recess 20 of the sleeve 18 and is connected with the ring-shaped space of the delivery stud 14 around the tube 16. The space enclosed between two partitions 11 is reduced during the further rotation of the rotor part 5, so that the air sucked in the same is pressed out. This delivered air enters through the slot 21 between the tube 16 and the narrowing of the Venturi-tube 15 in this latter component and takes along the medium to be transported, supplied through the tube 16. The end of the tube 16 can be adjusted in the Venturi-tube 15 by axial displacement of this tube in the support 17. The recesses 19 and 20 are made with an adequate depth for this purpose.

As may have appeared from the foregoing, the medium to be transported is not subjected to any alteration of direction in the pump and it does not come in contact with moving parts of the apparatus. Consequently, it is particularly adapted for displacing difiicult transportable or strong corrosive substances and the like. 7

The compressor may eventually be made as a device working in another manner.

Having now particularly described and ascertained the 3 myngjd inxeution'andin what manner the same tohsrsrf rmsd .1 declare that wha cl im i 1. An injector assembly of the character described comprising a compressor having a fixed part,,a rotary m ra sition d W thin the ha ed parity auinletsideand a delivery side, an air inlet conduit in communicationwith th inl t s d o t e comp essor, an a r-outlet c nd t in conununicatipn 1 th delivery side of the Compressor n ax a ali nment with name: and efining an injection opening, a ;tu,b c for conducting the medium to be conveyed passing through and spaced inwardly of said in]; and outlet ,conduitsand the rotary part of the comgressor to provide a spacing between said parts, a sleeve on tube intermediate ,the inlet and delivery sides of the compressor and constituting ,a bearing for the rotary pant o f the compressor, and lmfians associated with said eev secre i e on ro ry .II OW ment .or the rotary p to draw air into the compressor, compress same and deliver such compressed air from the delivery side into the outlet ,eqnduit, respectively whereby the compressed air tfl1'aw s-tl 1e medium through said tube and discharges ame wushthc i je i p n 2. An injector assembly as claimed in claim 1 wherein the outlet conduit is restricted to define a Venturi and means being provided to adjust the position of the tube clat et e en ur 3, An injector assembly as claimed inclaim 2 wherein rotarypa rt'is eccentrically mounted within said tfixed 1 3 1.

4. An injector assembly as claimed in claim 3 wherein said inlet conduit is carried by said rotary .part and said outlet conduitis carried by the fixed part of the compressor.

5. In an injector assembly, a compressor casing having a rotor eccentrically mounted therein, air inlet and air outlet ports in the rotor, an air delivery conduit communicating with the outlet ports and constituting an injection opening, a tube for conducting the medium to be conveyed positioned within and spaced from the rotor and said delivery conduit with one end thereof terminating short of the end of the delivery conduit, and means on said tube between the inlet and outlet ports of the rotor serving as a bearing for the rotor and on rotary movement of the rotor alternately closing and opening said inlet and outlet ports, respectively to draw air into the casing, compress the same and deliver such compressed air into the delivery conduit whereby the compressed air draws the medium through said tube and discharges the same thr u h t t nie ti oopenin References Cjted in the file of this patent Un -trap STATES PATENTS Germany Dec. 19, 1919 

